windows: Posix mode_t is void, not u0 now

To be consistent with the Wasi mode_t, use 'void'.

Author: rootbeer

lib/std/c.zig

@@ -136,8 +136,8 @@ pub const mode_t = switch (native_os) {
     .openbsd, .haiku, .netbsd, .solaris, .illumos => u32,
     .wasi => u32, // NOTE: wasi-without-libc maps mode_t to 'void'
     .freebsd, .macos, .ios, .tvos, .watchos, .visionos => u16,
-    .windows => u0,
-    else => u0, // TODO: should be void?
+    .windows => void,
+    else => void,
 };
 
 pub const nlink_t = switch (native_os) {

lib/std/fs/Dir.zig

@@ -4,8 +4,7 @@ pub const Handle = posix.fd_t;
 
 /// Default mode bits for a new directory.
 pub const default_mode = switch (posix.mode_t) {
-    void => {}, // wasi-without-libc has no mode suppport
-    u0 => 0, // Zig's Posix layer doesn't support modes on Windows
+    void => {},
     else => 0o755,
 };
 

lib/std/fs/File.zig

@@ -28,8 +28,7 @@ pub const Kind = enum {
 /// libc implementations use `0o666` inside `fopen` and then rely on the
 /// process-scoped "umask" setting to adjust this number for file creation.
 pub const default_mode = switch (posix.mode_t) {
-    void => {}, // WASI-without-libc has no mode support
-    u0 => 0, // Zig's Posix layer doesn't support modes for Windows
+    void => {},
     else => 0o666,
 };
 
@@ -495,7 +494,7 @@ pub fn stat(self: File) StatError!Stat {
         return .{
             .inode = info.InternalInformation.IndexNumber,
             .size = @as(u64, @bitCast(info.StandardInformation.EndOfFile)),
-            .mode = 0,
+            .mode = {},
             .kind = if (info.BasicInformation.FileAttributes & windows.FILE_ATTRIBUTE_REPARSE_POINT != 0) reparse_point: {
                 var tag_info: windows.FILE_ATTRIBUTE_TAG_INFO = undefined;
                 const tag_rc = windows.ntdll.NtQueryInformationFile(self.handle, &io_status_block, &tag_info, @sizeOf(windows.FILE_ATTRIBUTE_TAG_INFO), .FileAttributeTagInformation);

lib/std/posix/test.zig

@@ -119,7 +119,6 @@ test "chdir smoke test" {
 
 const default_mode = switch (posix.mode_t) {
     void => {},
-    u0 => 0,
     else => 0o666,
 };
 

src/link.zig

@@ -994,7 +994,7 @@ pub const File = struct {
         // with 0o755 permissions, but it works appropriately if the system is configured
         // more leniently. As another data point, C's fopen seems to open files with the
         // 666 mode.
-        const executable_mode = if (builtin.target.os.tag == .windows) 0 else 0o777;
+        const executable_mode = if (fs.File.Mode == void) {} else 0o777;
         switch (effectiveOutputMode(use_lld, output_mode)) {
             .Lib => return switch (link_mode) {
                 .dynamic => executable_mode,

src/link/Wasm.zig

@@ -440,8 +440,7 @@ pub fn createEmpty(
                 fs.File.default_mode | 0b001_000_000
             else
                 fs.File.default_mode
-        else
-            0,
+        else {},
     });
     wasm.name = sub_path;